<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <div style="height: 150px;background: aliceblue">头部</div>
    <div style="height: 150px;background:azure">导航</div>
    <div>
        <span style="display:inline-block;width: 25%;height: 100px;background: aquamarine">左</span>
        <span style="display:inline-block;width: 49%;height: 100px;background: beige">中</span>
        <span style="display:inline-block;width: 25%;height: 100px;background: aquamarine">右</span>
    </div>
    <div style="height: 150px;background: aliceblue">头部</div>
    <div style="height: 150px;background:azure">导航</div>
</div>
</body>
</html>
